Belt ply and belt assembly for a vehicle tyre and method for producing same

Abstract

Belt ply (10, 10a, 10b) for a vehicle tire (30), wherein the belt ply (10, 10a, 10b) comprises reinforcements (13, 13a, 13b) embedded in a rubber compound (11, 12), wherein the rubber compound (11) is electrically non-conductive in a first section (1, 1a, 1b) of the belt ply (10, 10a, 10b). The rubber compound (12) is electrically conductive in a second section (2, 2a, 2b) of the belt ply (10, 10a, 10b).

Description

[0001] The invention relates to a belt ply for a vehicle tire, wherein the belt ply comprises reinforcements embedded in a rubber mixture, wherein the rubber mixture is electrically non-conductive in a first section of the belt ply.

[0002] It is becoming increasingly common to use low-rolling-resistance rubber compounds to reduce the rolling resistance of vehicle tires. These low-rolling-resistance rubber compounds often exhibit a higher specific electrical resistance than conventional rubber compounds. For example, it is common to use silica instead of carbon black as a filler in a rubber compound, which can achieve advantageously low rolling resistance, but can also result in high electrical resistance between the road surface and the rim.

[0003] It is therefore necessary to create electrical bridges in the vehicle tire, which must, for example, also overcome belt layers arranged between the road surface and the rim if the belt layers have an excessively high electrical resistance.US 2011 / 0174420 A1 describes a pneumatic tire having a crown reinforcing belt formed by a plurality of superimposed reinforcing plies, each reinforcing ply resulting from the circumferential winding of one or more ply sections comprising mutually parallel wires embedded in a weakly electrically conductive rubber mixture, the sides of the circumferential ends of the sections being butted against one another to form a butt joint, an electrically conductive continuous linear element circumferentially circulating on the radially upper part of each of the plies and passing from the radially upper part of a first reinforcing ply to the radially upper part of a second reinforcing ply located directly above it, passing between the two sides of a butt joint of the second reinforcing ply.

[0004] The invention is based on the object of creating a belt ply and a belt assembly for a vehicle tire, as well as a vehicle tire, wherein the belt ply contributes to the lowest possible rolling resistance and electrical resistance of the vehicle tire, while also achieving high strength. Furthermore, a method for producing a belt ply in such a vehicle tire is to be created, wherein the overall tire structure is to be simplified.

[0005] The object is achieved according to the invention in that the rubber mixture is electrically conductive in a second section of the belt layer.

[0006] The invention resolves the trade-off between low rolling resistance and sufficient electrical conductivity at a high level and in a manner that is easily scalable for industrial use. By using a continuous belt layer with conductive and non-conductive sections, complex multi-part arrangements can be eliminated, thus increasing the stability of the vehicle tire and increasing the efficiency of its production.

[0007] Where the directional designations axial, in the axial direction, radial, in the radial direction and in the circumferential direction are used, these refer to the vehicle tire as it is properly fitted to a vehicle and the rolling movement it performs. The radial direction refers to a direction perpendicular to the axis of rotation of the vehicle tire and intersecting the axis of rotation. In the radial direction inwards refers to the orientation that faces the axis of rotation in the radial direction. In the radial direction outwards refers to the orientation that faces away from the axis of rotation in the radial direction. The circumferential direction describes the direction of a rolling movement around the axis of rotation. When the vehicle is moving forward, a position at the front on the vehicle tire in the circumferential direction passes through a minimum distance from the road surface earlier than a position at the rear in the circumferential direction during a 180° rotation of the vehicle tire.The axial direction refers to a direction parallel to the axis of rotation. Pointing axially inwards refers to an orientation that is axially facing a tire equator plane or a tire equator line. The tire equator plane is a plane perpendicular to the axis of rotation of the vehicle tire, which plane runs through the center of the axial width of the vehicle tire, with the tire equator line running in the tire equator plane and on the surface of the vehicle tire. The transverse direction is a direction that consists of components of the radial direction and / or the axial direction. The directional and position information described can also be applied to a belt ply and / or a belt assembly. The information is to be understood as absolute information with reference to a scenario according to which the belt ply or the belt assembly is installed in a vehicle tire as intended. In the case of a separate belt ply orof such a belt assembly, the information relative to the belt layer or belt assembly is to be understood as if the belt layer or belt assembly were installed in the vehicle tire as intended.

[0008] The effects achieved with the features of the main claim are supported and further enhanced by preferred embodiments and configurations.

[0009] A definition of an electrically conductive or non-electrically conductive rubber mixture must first be formulated relatively, in that the specific resistance after vulcanization is lower in the electrically conductive rubber mixture than in the electrically non-conductive rubber mixture. A boundary between electrically conductive and non-conductive rubber mixtures can be expressed in absolute terms in that an electrically conductive rubber mixture has a specific resistance of up to 1 × 10 12 < Ω cm, preferably up to 1 × 10 7 < Ω cm, and that an electrically non-conductive rubber mixture has a specific resistance of > 1 × 10 12 < Ω cm, in another embodiment > 1 × 10 7 < Ω cm, wherein the specific resistance of the electrically conductive rubber mixture is lower than that of the electrically non-conductive rubber mixture.The wide range of specified limit values results, among other things, from the possible variations in the geometries of components that can be used in a vehicle tire: For example, the thicker the belt layer in the second section, the lower the specific resistance of the conductive rubber compound must be in order not to exceed a given resistance for overcoming the belt layer; for example, the larger the contact area between the second section of the belt layer and other components of an electrical bridge through the vehicle tire, the greater the specific resistance of the conductive rubber compound can be in order to be able to undercut a given resistance on a path between the road surface and the rim. Alternatively or additionally, the specific application of the invention can have an impact on reasonable limit values for defining an electrically conductive or non-conductive rubber compound.For example, the leakage resistance of a tire classified as conductive according to WDK Standard 110 / ISO 16392 must not exceed a value of 1 × 10 6 < Ω; in this case, the electrically conductive rubber compound preferably has a specific resistance of < 1 × 10 7 < Ω cm. For example, for original equipment of vehicles, e.g., on the European market, a limit value for the resistance between the road surface and the rim of 1 × 10 8 < Ω is common; in this case, the electrically conductive rubber compound preferably has a specific resistance of < 1 × 10 10 < Ω cm. For example, the leakage resistance of a tire classified as "dissipative" according to WDK Standard / ISO 16392 must not exceed a value of 1 × 10 10 < Ω; In this case, the electrically conductive rubber compound preferably has a specific resistance of < 1 × 10 12< Ω cm.

[0010] The rubber compound in the first section is preferably characterized by low hysteresis. Preferably, the rubber compound in the first section is better suited to minimizing the rolling resistance of the vehicle tire than the rubber compound in the second section. In this way, the first section can be optimized for good rolling resistance and the second section for electrical conductivity, with consistently high strength being achieved in both sections thanks to the reinforcements running through both sections. A suitable filler for the rubber compound in the first section is silica.

[0011] The reinforcements in the belt layer may comprise steel and are preferably made of steel, except for the rubber coating embedding them. The reinforcements can be embedded in the rubber compounds in a conventional manner, for example, using a calender.

[0012] In a preferred embodiment of the belt ply, a boundary between the first section and the second section runs parallel to a course of the strength members in the first section and the second section. If the strength members run, for example, at an angle between 18° and 32° to the axial direction or the width direction of the belt ply, the boundary can run at the aforementioned gradient across the entire width of the belt ply. In this way, the strength of the belt ply is not impaired by interruptions in the strength members. Furthermore, a belt ply with a corresponding boundary course can be produced particularly efficiently, as can be seen in the context of the above and / or below description of the method according to the invention.

[0013] The first section and / or the second section can each be strip-shaped, in the sense that they have a substantially constant width in the circumferential direction. The first section can have a greater circumferential extent than the second section. The circumferential extent of the first section can be between 1 and 20 times, preferably between 2 and 10 times, the circumferential extent of the second section. In this way, sufficient conductivity can be achieved while maintaining very good rolling resistance.

[0014] The first section of the belt ply can border on a second section of the belt ply on both sides in the circumferential direction. The second section of the belt ply can border on a first section of the belt ply on both sides in the circumferential direction. This can be achieved in a belt ply with a single first and a single second section, in which case the first section would border on the second section on both circumferential sides and vice versa. Alternatively, the belt ply can comprise a plurality of first and / or second sections with the features of the first and second sections described in claim 1, respectively. According to one embodiment, the belt ply consists exclusively of such first and second sections. The belt ply can comprise a number n of first sections and a number m of second sections.The number n can correspond to a natural number between 1 and 30, preferably between 3 and 15, and / or the number m can correspond to a natural number between 1 and 30, preferably between 3 and 15. By distributing as many first sections as possible across the belt layer, a uniformly low rolling resistance can be achieved across the entire tire. By distributing as many second sections as possible across the belt layer, the number of possible conductive bridges through the tire can be increased. A low total number of sections, in turn, is beneficial to the strength of the tire and simplifies the production of the belt layer. In view of the advantages and disadvantages mentioned, good compromises can be found in the areas mentioned.

[0015] The invention further relates to a belt assembly for a vehicle tire. The belt assembly comprises at least one and preferably at least two of the belt layers according to the invention described above and / or below. In the case of a belt assembly comprising two or more belt layers according to the invention, the belt layers can be arranged one above the other in the radial direction, wherein the second section of a radially lower belt layer is in direct electrical contact with the second section of a belt layer arranged radially immediately above it. In this way, an electrical bridge running radially through the belt assembly can be formed.

[0016] The strength members in the first belt layer can run at an opposite gradient to the strength members in the second belt layer. This corresponds to a known arrangement which can be advantageous for the strength of the belt assembly. According to the invention, in combination with the crossed strength members, a synergistic advantage arises if a boundary between the first section and the second section in both belt layers runs parallel to the course of the respective strength members: If two strip-shaped second sections in the first and second belt layers ran at the same gradient, there would be more relative circumferential positions at which the two second sections would not overlap than with strip-shaped sections running at opposite gradients.

[0017] Second sections of the first belt ply and second sections of the second belt ply are in direct electrical contact with one another in a number of k separate contact regions, where k preferably corresponds to a natural number between 1 and 100, more preferably between 2 and 10. In one embodiment, a second section of the first belt ply is in contact with a second section of the second belt ply. A contact region can correspond to the region of an overlap between two second sections. If the second sections each have a strip shape, a contact region can be diamond-shaped in an area spanned by the axial and circumferential directions.

[0018] At least one of the contact areas can be arranged entirely within an axial distance of a maximum of 30% of an axial width of the belt assembly from an axial center of the belt assembly. This preferably applies to all contact areas. Further preferably, the axial center of the belt assembly intersects the at least one and preferably all contact areas. By arranging the contact areas near a tire equator, proximity to a carbon center beam, which is generally known from vehicle tires, can be established, thereby reducing the length of an electrical path through the tire.In addition, by arranging the contact areas in an axially central region, it is possible to reduce the proportion of less suitable rubber compounds of the second sections in the shoulder areas for optimizing rolling resistance. Particularly in the shoulder areas, significant heat generation can occur at high speeds due to hysteresis effects, which can be mitigated by primarily using the rolling resistance-optimized rubber compounds of the first sections.

[0019] The invention also relates to a vehicle tire with a belt ply and / or a belt assembly according to the above and / or following description. Vehicle tires designed according to the invention are tires of any design, in particular radial tires, and tires of any type, in particular pneumatic vehicle tires for motor vehicles, such as passenger cars, light trucks, or commercial vehicles.

[0020] The vehicle tire may comprise a belt bandage, wherein the belt bandage may be arranged radially above the belt layer or the belt assembly. The belt bandage may comprise a first section and a second section, wherein the first section is electrically non-conductive and the second section is electrically conductive. Preferably, the second section of the belt bandage is in electrical contact with the second section of the belt layer or with the second section of one of the belt layers in the belt assembly. In this way, an electrical bridge can be created through the belt assembly and the belt bandage.

[0021] The belt bandage can be designed as a spool bandage. A spool bandage is a belt bandage wound from a length to be wound onto the belt assembly. The spool bandage can comprise strength members which run through the length to be wound, preferably as continuous cords along the longitudinal direction of the length to be wound, and which can be made of aramid, nylon, PET, or mixtures of these materials, for example. The spooled length can run at a larger absolute angle to the axial direction than the strength members of the belt layers. The second section of the belt bandage can be axially delimited by two first sections of the belt bandage. The second section of a first belt layer, the second section of a second belt layer, and the second section of the belt bandage can overlap one another.The second section of the belt bandage may overlap with several, preferably all, contact areas between the second sections of the belt layers.

[0022] The vehicle tire can comprise an electrically non-conductive tread, wherein an electrically conductive channel extends radially through the tread. An electrically non-conductive tread can comprise at least either a cap or a base, each of which is based on an electrically non-conductive rubber compound. Preferably, both the cap and the base of the tread are optimized for low rolling resistance and, in turn, are both based on electrically non-conductive rubber compounds. The electrically conductive channel can extend from a tread on a radial upper side of the cap through the cap and the base to a radial underside of the base and can extend over the entire circumference of the vehicle tire. In particular, the electrically conductive channel can be designed as a carbon center beam, which is known per se.The electrically conductive channel can make electrically conductive contact with the second section of the belt bandage and, in particular, can make electrically conductive contact in direct mechanical contact.

[0023] The vehicle tire may comprise a sidewall, wherein the sidewall may be based on an electrically non-conductive rubber compound. The vehicle tire may comprise a carcass, wherein the carcass may be based on an electrically conductive rubber compound. Overall, a continuous electrically conductive path may run through the tread, the belt bandage, the belt bandage, and the carcass. In the manner described, electrical charge can be shifted and dissipated between a rim, which may be conductively connected to the carcass, and a road surface, which may be in contact with the electrically conductive channel through the tread.The electrically conductive partial paths between the second section of a radially upper belt layer of the belt assembly and the road surface on one side, and between the second section of a radially lower belt layer of the belt assembly and the rim on the other side, can also be implemented using alternative structures. For example, the belt assembly and / or the carcass can be based on electrically non-conductive rubber compounds, whereby electrically conductive paths can be created, for example, with the aid of electrically conductive yarns.

[0024] Overall, the specific resistances and dimensions of the assemblies defining the electrically conductive path between the road surface and the rim should be such that the electrically conductive path has a resistance of less than 1×10 10< Ω, preferably less than 1×10 8< Ω, more preferably less than 1×10 6< Ω.

[0025] The invention also relates to a method for producing a belt ply according to the above and / or following description. For this purpose, a first section and a second section are provided and then joined together.

[0026] The first section can be provided by cutting the first section off a first cord web at an angle of between 5° and 85° to a path of the strength members in the first section. This can be done on a production line of a conventional type, wherein the cord cutting can be done in a conventional manner by punching a first cord web at a predetermined angle into first sections, each corresponding to the axial width of the belt layer. The second section can be provided by cutting the second section off a second cord web at an angle of between 5° and 85° to a path of the strength members in the second section. The second cord web can be punched at a predetermined angle into second sections, each corresponding to the axial width of the belt layer.

[0027] The second section is preferably severed from the second cord at the same angle as the first section is severed from the first cord. The second section is preferably provided with the reinforcements aligned parallel to the reinforcements in the first section. The first and second cords can be unwound parallel to each other and cut using the same device. In particular, the first and second sections can be severed from the corresponding cords simultaneously.

[0028] The first section and the second section can be joined together by a splicing process. In particular, several first and second sections can be joined together in an alternating manner using a splicing roller, butt-jointed in a conventional manner, resulting in a straight-edged endless belt, which can be further processed, for example, into the first and / or second belt layer.

[0029] The method can be further developed with additional features described in connection with the vehicle tire according to the invention, the belt assembly according to the invention, and / or the belt bandage according to the invention. The vehicle tire, the belt assembly, and / or the belt ply can be further developed with additional features described in connection with the method according to the invention. The vehicle tire, the belt assembly, and the belt ply can each be further developed with features described in connection with the two other products.

[0030] The invention is described below by way of example with reference to advantageous embodiments in the accompanying drawings. They show: Figure 1 schematically shows an equivalent circuit diagram for an electrical path through an embodiment of a vehicle tire according to the invention, Figure 2schematically an embodiment of a first belt layer according to the invention, Figure 3 schematically an embodiment of a second belt layer according to the invention, Figure 4 schematically an embodiment of a belt bandage according to the invention, Figure 5 schematically an embodiment of a belt bandage according to the invention with a belt bandage, Figure 6 schematically shows a production line suitable for producing an embodiment of a belt layer according to the invention.

[0031] Figure 1shows a schematic circuit diagram of an electrical path through a vehicle tire 30, between a road surface 38 and a rim 37. Each of the drawn rectangles represents an electrical resistance of a component in the vehicle tire 30. A cross next to a rectangle indicates that this component is based on an electrically non-conductive rubber compound, so that the component is not a significant part of an electrical path through the vehicle tire 30. A check mark next to a rectangle indicates that this component is based on an electrically conductive rubber compound, so that the component is a significant part of an electrical path through the vehicle tire 30.

[0032] The vehicle tire comprises a tread comprising a cap 31 and a base 32, wherein the cap 31 and base 32 contain rubber compounds optimized for rolling resistance and are electrically non-conductive. The tread 31, 32 is bridged by an electrically conductive channel 33, wherein the electrically conductive channel 33 can be designed, for example, as a carbon center beam 33, which electrically bridges both the cap 31 and the base 32 radially. A belt bandage 40 is divided into a first and a second section 41, 42, wherein the first section 41 is electrically non-conductive and contains a rubber compound optimized for rolling resistance. The second section 42 is based on an electrically conductive rubber compound and establishes an electrical connection between the carbon center beam 33 and a belt assembly 20. The belt assembly 20 can comprise a plurality of belt layers 10, 10a, 10b.First sections 1, 1a, 1b of the belt layers 10, 10a, 10b are based on electrically non-conductive rubber compounds 11; second sections 2, 2a, 2b of the belt layers 10, 10a, 10b are based on electrically conductive rubber compounds 12.

[0033] If the belt assembly 20 comprises a plurality of belt layers 10a, 10b arranged radially one above the other, the second sections 2a, 2b can be arranged such that a radially continuous electrical connection is established between the belt assembly 40 and a carcass 34, wherein the carcass 34 in the example shown is based on a conductive rubber compound. A sidewall 35, in contrast, is based in the example shown on an electrically non-conductive rubber compound optimized for rolling resistance. The carcass 34 creates an electrical bridge between the belt assembly 20 and an electrically conductive rim strip 36, which in turn is electrically conductively connected to the rim 37. Due to the inventive design with first sections 1, 1a, 1b and second sections 2, 2a, 2b of the belt layers 10, 10a, 10b, the belt assembly 20 can, on the one hand, contribute to a low rolling resistance of the vehicle tire 30; on the other hand, for example, according to the Figure 1 An electrical bridge can be specifically implemented in the belt assembly 20 using the electrical path shown.

[0034] Figure 2shows a schematic representation of an embodiment of a first belt ply 10a according to the invention. From left to right, the entire axial width of the belt ply 10a is depicted, with the circumferential extent of the belt ply being shown over 360° from top to bottom in the drawing plane. The axial direction and circumferential direction are not shown in the actual scale ratio in the illustration, with the axial direction being shown greatly enlarged for clarity. The belt ply 10a comprises three strip-shaped second sections 2a which run at an angle to the axial direction and are based on a conductive rubber compound 12. First sections 1a are formed seamlessly adjoining the second sections 2a and make up the remaining surface of the belt ply 10a and are based on a non-conductive rubber compound 11 which is optimized for rolling resistance.The belt layer 10a comprises, in both sections 1a, 2a, strength members 13a arranged parallel to one another, the longitudinal extent of which is shown in . Figure 2 is indicated representatively at the boundaries between sections 1a and 2a.

[0035] Figure 3 shows in a Figure 2comparable view of a second belt ply 10b. The second belt ply 10b is constructed in principle identically to the first belt ply 10a, with first sections 1b, second sections 2b, corresponding rubber compounds 11, 12, and reinforcements 13b. However, the course of the reinforcements 13a, 13b and the boundary courses between the first sections 1a, 1b and second sections 2a, 2b are, according to the embodiments shown, essentially mirror-inverted in the first and second belt ply 10a, 10b. In alternative embodiments, the reinforcements 13a, 13b and boundary courses in the two belt plies 10a, 10b can also be designed to cross one another, but do not necessarily have to be mirrored to one another.

[0036] Figure 4 shows the two belt layers 10a, 10b according to the Figures 2 and 3radially stacked one above the other in a belt assembly 20. Contact areas 21 are formed in areas of overlap between the second sections 2a, 2b of the two belt layers 10a, 10b. These contact areas 21 provide conductivity channels radially penetrating the belt assembly 20.

[0037] Figure 5 shows schematically and in detail the belt assembly 20 according to Figure 4with a belt bandage 40 arranged radially above it. The belt bandage 40 comprises a second section 42, which is based on an electrically conductive rubber compound, as well as two first sections 41 which axially frame the second section 42 and are each based on an electrically non-conductive rubber compound optimized for rolling resistance. In the example shown, the belt bandage 40 is designed as a coil bandage, wherein the pitch of the windings of the coil bandage corresponds to the drawn boundary lines between the sections 41, 42. Because the second section 42 of the belt bandage 40 overlaps the contact areas 21 of the belt assembly 20, a radially continuous, electrically conductive path through the belt bandage 40 and the belt assembly 20 is ensured, which leads radially upwards, for example, through a carbon center beam 33 (cf. Figure 1 ) can be continued.

[0038] Figure 6shows a schematic representation of a production line 50 on which the method according to the invention for producing a belt ply 10 can be carried out. At the entrance of the production line 50, a roll 51 is arranged, from which a first cord web 14 is unwound. In a manner known per se, an intermediate layer 53, which is released during unwinding of the cord web 14 and is intended to protect and separate the individual windings of the cord web 14, is wound onto an idler roll 54. From the same or an additional roll 52, a second cord web 15 is unwound, the second cord web 15 being shown hatched with curved lines to better distinguish it from the first cord web 14. The first and second cord webs 14, 15 are preferably unwound parallel to one another. The course of the reinforcement members 13 arranged in the cord webs 14, 15 is shown in Figure 6only schematically, shown by dashed lines, whereby the areal density of the reinforcements 13 in the cords 14, 15 in most embodiments is greater than the density of the dashed lines in Figure 6 will be.

[0039] In a punching station 55, the cord webs 14, 15 are punched into sections 1, 2, wherein the sections 1, 2 each have an axial width corresponding to the belt layer 10 to be produced. The cord webs 14, 15 are severed at an angle other than 90° to the course of the reinforcements 13 in the cord webs 14, 15, so that the shape of a parallelogram is obtained for the sections 1, 2. The individual sections 1, 2 punched in this way are then Figure 6only schematically shown as a black box splice station 56, so that a straight-edged endless belt 61 is created, which can be cut to size and further processed into a first and / or second belt layer 10, 10a, 10b.

[0040] Sections 1, 2 are guided through the production line 50 in a manner known per se by means of conveyor belts 57. At the end of the production line 50, the assembled strip 61 from sections 1, 2 is wound onto a cassette 58, with an intermediate layer 59 being fed from a follower 60 to protect and separate the individual windings. List of reference symbols

[0041] 1First section of the belt layer 1aFirst section of the first belt layer 1bFirst section of the second belt layer 2zSecond section of the belt layer 2aSecond section of the first belt layer 2bSecond section of the second belt layer 10Belt layer 10aFirst belt layer 10bSecond belt layer 11Rubber compound (non-conductive) 12Rubber compound (conductive) 13Strength members 13aStrength members in the first belt layer 13bStrength members in the second belt layer 14First cord layer 15Second cord layer 20Belt assembly 21Contact area 30Vehicle tire 31Cap (tread) 32Base (tread) 33Conductivity channel (carbon center beam) 34Carcass 35Sidewall 36Rim strip 37Rim 38Road surface 40Belt bandage 41First section of the Belt bandage 42Second section of the belt bandage 50Production line 51Roll (for cord 14) 52Roll (for cord 15) 53Intermediate layer (for winding cord 15) 54Idler roll (for roll 51) 55Punching station 56Splicing station 57Conveyor belt 58Cassette59Intermediate layer (for winding the endless belt from sections 1, 2) 60Idler roller (for cassette 58) 61Straight-edged endless belt

Claims

1. Belt ply (10, 10a, 10b) for a vehicle tire (30), wherein the belt ply (10, 10a, 10b) comprises reinforcements (13, 13a, 13b) embedded in a rubber mixture (11, 12), wherein the rubber mixture (11) is electrically non-conductive in a first section (1, 1a, 1b) of the belt ply (10, 10a, 10b), characterized by that the rubber mixture (12) is electrically conductive in a second section (2, 2a, 2b) of the belt layer (10, 10a, 10b).

2. Belt layer (10, 10a, 10b) according to claim 1, characterized in that the rubber mixture (11) in the first section (1) is better suited to minimizing a rolling resistance of the vehicle tire (30) than the rubber mixture (12) in the second section (2).

3. Belt layer (10, 10a, 10b) according to one of claims 1 or 2, characterized in thata boundary between the first section (1, 1a, 1b) and the second section (2, 2a, 2b) runs parallel to a course of the strength members (13, 13a, 13b) in the first section (1, 1a, 1b) and the second section (2, 2a, 2b).

4. Belt layer (10, 10a, 10b) according to one of claims 1 to 3, characterized in that the first section (1, 1a, 1b) borders on both sides in the circumferential direction on a second section (2, 2a, 2b), wherein the second section (2, 2a, 2b) borders on both sides in the circumferential direction on a first section (1, 1a, 1b).

5. Belt layer (10, 10a, 10b) according to one of claims 1 to 4, characterized in that the belt layer (10, 10a, 10b) comprises a number n of first sections (1, 1a, 1b) and a number m of second sections (2, 2a, 2b).

6. Belt layer (10, 10a, 10b) according to claim 5, characterized in thatthe number n corresponds to a natural number between 1 and 30, preferably between 3 and 15, wherein the number m corresponds to a natural number between 1 and 30, preferably between 3 and 15.

7. Belt assembly (20) with two belt layers (10a, 10b) according to one of claims 1 to 6, characterized in that the belt layers (10a, 10b) are arranged one above the other in the radial direction, wherein the second section (2a) of the first belt layer (10a) is in direct electrical contact with the second section (2b) of the second belt layer (10b).

8. Belt bandage (20) according to claim 7, characterized in that the strength members (13a) in the first belt layer (10a) run at an opposite gradient to the strength members (13b) in the second belt layer (10b).

9. Belt bandage (20) according to one of claims 7 or 8, characterized in thatsecond sections (2a) of the first belt layer (10a) and second sections (2b) of the second belt layer (10b) are in direct electrical contact at a number k of mutually separated contact areas (21), where k corresponds to a natural number between 1 and 100, preferably between 2 and 10.

10. Belt bandage (20) according to claim 9, characterized in that at least one of the contact regions (21) is arranged entirely within an axial distance of a maximum of 30% of an axial width of the belt assembly (20) from an axial center of the belt assembly (20).

11. Vehicle tire (30) with a belt layer (10, 10a, 10b) and / or a belt assembly (20) according to one of claims 1 to 10.

12. Vehicle tire (30) according to claim 11, characterized in thatthe vehicle tire comprises a belt bandage (40), wherein the belt bandage (40) is arranged radially above the belt layer (10, 10a, 10b) or the belt assembly (20), wherein the belt bandage (40) comprises a first section (41) and a second section (42), wherein the first section (41) is designed to be electrically non-conductive and wherein the second section (42) is designed to be electrically conductive, wherein the second section (42) of the belt bandage is in electrical contact with the second section (2, 2a, 2b) of the belt layer (10, 10a, 10b) or with the second section of one of the belt layers (10, 10a, 10b) in the belt assembly (20).

13. A method for producing a belt layer (10, 10a, 10b) according to one of claims 1 to 6, characterized by that a first section (1, 1a, 1b) and a second section (2, 2a, 2b) are provided and connected to each other.

14. The method according to claim 13, wherein the first section (1, 1a, 1b) is provided in that the first section is separated from a first cord sheet (14) at an angle between 5° and 85° to a course of the strength members (13, 13a, 13b) in the first section (1, 1a, 1b), wherein the second section (2, 2a, 2b) is provided in that the second section (2, 2a, 2b) is separated from a second cord sheet (15) at an angle between 5° and 85° to a course of the strength members (13, 13a, 13b) in the second section (1, 1a, 1b).

15. The method according to one of claims 13 or 14, wherein the first section (1, 1a, 1b) and the second section (2, 2a, 2b) are connected to each other by a splicing process.

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